吸水性微胶囊/水泥基材料的多尺度界面表征及其自修复效果  

Multiscale interfacial characterization and self-healing effect of water-absorbing microcapsules/cement-based materials

作　　者：师树青 毛倩瑾[1,2] 陈佳艺 张璐 王子明[1,2] 崔素萍[1,2] SHI Shuqing;MAO Qianjin;CHEN Jiayi;ZHANG Lu;WANG Ziming;CUI Suping(College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China;Key Laboratory of New Functional Materials,Beijing 100124,China)

机构地区：[1]北京工业大学材料科学与工程学院,北京100124 [2]新型功能材料教育部重点实验室,北京100124

出　　处：《复合材料学报》2025年第3期1578-1587,共10页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金项目-创新研究群体项目(51621003)。

摘　　要：针对以海藻酸钙为壳、环氧树脂E-51为核的吸水性微胶囊(SA)与水泥基体界面结合力较弱的问题,利用硅烷偶联剂对SA微胶囊表面进行修饰处理,改善其与水泥基体的界面结合,以提升自修复效果。采用SEM、显微硬度和拉拔试验等分析测试手段分别从微观、介观到宏观尺度分析界面结合情况,并通过砂浆试件损伤修复后的抗压强度、抗水渗透性的恢复率来评价自修复效果。研究结果表明:SA经偶联剂KH792修饰处理后,与水泥基体的界面结合更为紧密,界面处显微硬度提高了159%,界面粘结强度提高了67%;掺加4wt%(水泥质量)SA的砂浆,荷载损伤修复后抗压强度恢复率103%,水压损伤修复后抗渗性恢复率达到118%。硅烷偶联剂表面修饰显著提升了SA与水泥基体的界面结合,水泥基材料自修复效果增强。Aiming at the problem of weak interfacial binding force between the absorbent microcapsule(SA)with calcium alginate as shell and epoxy resin E-51 as core and cement matrix,silane coupling agent was used to modify the surface of SA microcapsule to improve its interfacial binding with cement matrix,so as to improve the self-healing effect.By means of SEM,microhardness and drawing test,the interface bonding was analyzed from micro,mesoscopic to macro scale,and the self-healing effect was evaluated by the recovery rate of compressive strength and water permeability resistance of the mortar specimen after damage repair.The results show that the interface bond between SA and cement matrix is closer after modification with coupling agent KH792,the microhardness at the interface is increased by 159%,and the interface bond strength is increased by 67%.For the mortar mixed with 4wt%(cement mass)SA,the compressive strength recovery rate after load damage is 103%,and the seepage resistance recovery rate after water pressure damage is 118%.The surface modification of silane coupling agent significantly improved the interface bonding between SA and cement matrix,and the self-healing effect of cementbased materials was enhanced.

关 键 词：水泥基材料 自修复 吸水性微胶囊 多尺度界面分析 表面修饰 

分 类 号：TU599[建筑科学—建筑技术科学] TB332[一般工业技术—材料科学与工程]